WO2009128281A1 - Circuit de pilotage d'un appareil d'affichage à cristaux liquides - Google Patents

Circuit de pilotage d'un appareil d'affichage à cristaux liquides Download PDF

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Publication number
WO2009128281A1
WO2009128281A1 PCT/JP2009/050710 JP2009050710W WO2009128281A1 WO 2009128281 A1 WO2009128281 A1 WO 2009128281A1 JP 2009050710 W JP2009050710 W JP 2009050710W WO 2009128281 A1 WO2009128281 A1 WO 2009128281A1
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WO
WIPO (PCT)
Prior art keywords
voltage
liquid crystal
signal line
power supply
circuit
Prior art date
Application number
PCT/JP2009/050710
Other languages
English (en)
Japanese (ja)
Inventor
田中　紀行
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to US12/735,713 priority Critical patent/US20100315405A1/en
Priority to CN2009801049915A priority patent/CN101939779B/zh
Publication of WO2009128281A1 publication Critical patent/WO2009128281A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/13606—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit having means for reducing parasitic capacitance
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers

Definitions

  • FIG. 8 is a diagram illustrating a voltage waveform applied to the pixel 16.
  • Vgd and Vcs are expressed by the following equations.
  • Vgd A ⁇ (Vgh ⁇ Vgl)
  • Vcs B ⁇ (Vcsh ⁇ Vcsl)
  • the voltage of the scanning signal line 22 (GL) changes from Vgh to Vgl.
  • FIG. 9 shows a reference power supply voltage (source driver reference power supply: positive side high level / positive side low level / negative side high level / negative side low level) for the source driver (video signal line driving circuit 52), counter electrode 42 potential Vcom, video signal polarity at the time of line inversion driving, video signal line voltage, voltage of each scanning signal line 22 (GLn) and corresponding auxiliary capacity power supply line 24 (CSn), and the pixel 16 are applied.
  • Each waveform of the liquid crystal applied voltage Vdln is shown.
  • Each video signal line voltage is 1+ when the first line is positive, 1- when the first line is negative, and similarly 2 + / 2-,..., N + / n ⁇ . It is represented.
  • the storage capacitor power line 24 (CSn) does not change for each scanning signal line 22, more specifically, for each odd line / even line. (See the dotted ellipse in FIG. 9). This is a cause of the occurrence of horizontal stripes. This will be described below.
  • the liquid crystal application voltage Vdl is alternately different for each scanning signal line 22, and a horizontal streak-like bright line is visually recognized.
  • the driving circuit of the liquid crystal display device of the present invention provides A scanning signal line; A switching element that is turned on / off by the scanning signal line; A pixel electrode connected to one end of the switching element; Including a plurality of rows including auxiliary capacitance power lines for forming auxiliary capacitance, and
  • a scanning signal line driving circuit for outputting a scanning signal for turning on the switching element of the row in a horizontal scanning period sequentially assigned to each row;
  • a video signal line driving circuit that outputs a video signal whose polarity is reversed in the horizontal scanning period adjacent to the same row while the polarity is reversed in synchronization with the horizontal scanning period of each row;
  • a reference voltage generating unit connected to the video signal line driving circuit;
  • An auxiliary capacity electrode drive circuit that outputs an auxiliary capacity power line voltage whose polarity is inverted every frame with respect to the auxiliary capacity power line;
  • a driving method using an auxiliary capacitor in addition to a liquid crystal capacitor is employed.
  • the reference voltage generating unit is provided so that the arbitrary voltage can be supplied as the reference power supply voltage only in the first frame period at the start of display.
  • a plurality of types of reference power supply voltages can be set, and a selection circuit for selecting one reference power supply voltage is provided. Therefore, it is possible to easily suppress the occurrence of horizontal streak-like bright lines.
  • the reference voltage generation unit is provided with a digital-analog conversion circuit and an amplifier connected to the digital-analog conversion circuit,
  • the selection circuit may be provided on the input side of the digital-analog conversion circuit.
  • the reference voltage generation unit is provided with a digital-analog conversion circuit and an amplifier connected to the digital-analog conversion circuit,
  • the selection circuit may be provided on the output side of the amplifier.
  • each reference voltage has its own digital-analog conversion circuit / amplifier, a stable reference voltage can be output.
  • a counter electrode facing the pixel electrode is formed;
  • a liquid crystal layer is provided between the pixel electrode and the counter electrode,
  • the influence of the auxiliary capacitor power line voltage on the potential of the pixel electrode is as follows: The product of the auxiliary capacity and the fluctuation width of the auxiliary capacity power supply line voltage, It is preferable that the value is substantially equal to a value obtained by dividing the liquid crystal capacitance formed in the liquid crystal layer, the parasitic capacitance formed between the pixel electrode and the scanning signal line, and the auxiliary capacitance.
  • a drive circuit for a liquid crystal display device capable of suppressing the generation of horizontal streak-like bright lines in the first frame period at the start of display and the last frame period at the end of display is provided with a small increase in circuit. There is an effect that can be done.
  • the auxiliary capacitance electrodes 44 are connected to the auxiliary capacitance power supply line 24 for each auxiliary capacitance electrode 44 belonging to the same line (row).
  • the video signal line driving circuit 52 source driver to which the video signal lines 20 are connected
  • the scanning signal line driving circuit 54 gate driver to which the scanning signal lines 22 are connected
  • a storage capacitor electrode driving circuit 56 to which each storage capacitor power line 24 is connected is provided in the peripheral portion.
  • FIG. 2 is a circuit diagram showing a detailed configuration of the auxiliary capacitance electrode driving circuit 56. As shown in FIG. This figure shows only a part, and the circuit shown in FIG. 2 is formed on each auxiliary capacitance electrode 44. That is, the same number of auxiliary capacitance power supply lines 24 as the scanning signal lines 22 are provided, and an auxiliary capacitance electrode drive circuit 56 is provided for each auxiliary capacitance power supply line 24.
  • the liquid crystal applied voltage Vdl (Vsl2 ⁇ Vgd + Vcs) ⁇ Vcom as a difference from the counter electrode Vcom.
  • FIG. 3 is a timing chart showing voltage waveform diagrams applied to each pixel at the start of display in the embodiment of the present invention.
  • the storage capacitor power line voltage (CS2) does not change. This is because the storage capacitor power line voltage (CS2) is already Vcsl from the power-on period. Since the storage capacitor power line voltage (CS2) does not change, the liquid crystal application voltage Vdl2 does not shift, and the liquid crystal application voltage Vdl differs from other lines.
  • the reference power supply voltage for the source driver 52 in the first frame (between BC) after the start of display (negative side High level / negative side Low level) ) can be controlled separately from the voltage during normal display, and as a result, it is possible to prevent the horizontal streak-like bright lines from being visually recognized.
  • the selection circuit 86 is provided before the level setting data 80 is input to the DAC unit 82. In other words, the selection circuit 86 is provided at the input portion of the DAC unit 82. In this configuration, since it is not necessary to provide the DAC unit 82 and the AMP unit 84 for each reference voltage, the number of components can be reduced.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Un circuit de pilotage d'un appareil d'affichage à cristaux liquides de type à matrice active comprend un circuit de pilotage de lignes de signaux de balayage ; un pilote de source (52) qui émet un signal vidéo dont la polarité est inversée par trame tout en étant inversée en synchronisme avec les intervalles de balayage horizontal ; une partie de production de tension de référence (70) qui est couplée au pilote de source (52) ; et un circuit de pilotage d'électrode capacitive auxiliaire qui transmet à une ligne d'alimentation électrique capacitive auxiliaire une tension de ligne d'alimentation électrique capacitive auxiliaire dont la polarité est inversée à chaque trame. La partie de production de tension de référence (70), qui comprend des circuits de sélection (86), chacun d'entre eux sélectionnant une tension d'alimentation électrique de référence pendant un affichage normal ou une tension d'alimentation électrique de référence au début d'un affichage, délivre la tension d'alimentation électrique de référence au début de l'affichage à titre de tension d'alimentation électrique de référence destinée au pilote de source (52) pendant le premier intervalle de trame, juste après le début de l'affichage, ce qui supprime l'apparition de lignes d'émission horizontales filiformes au cours du premier intervalle de trame, juste après le début de l'affichage.
PCT/JP2009/050710 2008-04-16 2009-01-20 Circuit de pilotage d'un appareil d'affichage à cristaux liquides WO2009128281A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/735,713 US20100315405A1 (en) 2008-04-16 2009-01-20 Driving circuit for liquid crystal display device
CN2009801049915A CN101939779B (zh) 2008-04-16 2009-01-20 液晶显示装置的驱动电路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-107185 2008-04-16
JP2008107185 2008-04-16

Publications (1)

Publication Number Publication Date
WO2009128281A1 true WO2009128281A1 (fr) 2009-10-22

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PCT/JP2009/050710 WO2009128281A1 (fr) 2008-04-16 2009-01-20 Circuit de pilotage d'un appareil d'affichage à cristaux liquides

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US (1) US20100315405A1 (fr)
CN (1) CN101939779B (fr)
WO (1) WO2009128281A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010143501A1 (fr) * 2009-06-09 2010-12-16 シャープ株式会社 Appareil d'affichage et procédé de commande d'un appareil d'affichage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103929864B (zh) * 2014-05-06 2015-11-25 深圳市绿源半导体技术有限公司 用于led驱动电路的电荷控制方法及装置、led驱动电路
EP3958244A4 (fr) * 2019-03-19 2022-11-09 BOE Technology Group Co., Ltd. Substrat d'affichage, dispositif d'affichage, procédé de commande et circuit de commande

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10214067A (ja) * 1996-11-26 1998-08-11 Sharp Corp 液晶表示画像の消去装置及びそれを備えた液晶表示装置
JP2003050565A (ja) * 2000-06-29 2003-02-21 Matsushita Electric Ind Co Ltd 液晶表示システム、表示信号供給装置、及び液晶表示装置
JP2005031501A (ja) * 2003-07-09 2005-02-03 Sony Corp フラットディスプレイ装置及び集積回路
JP2006106293A (ja) * 2004-10-04 2006-04-20 Sharp Corp 表示素子駆動装置及びその表示素子駆動装置を備えた表示装置並びに表示素子駆動方法
JP2007025701A (ja) * 2005-07-20 2007-02-01 Samsung Electronics Co Ltd 表示装置の駆動装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3649211B2 (ja) * 2002-06-20 2005-05-18 セイコーエプソン株式会社 駆動回路、電気光学装置及び駆動方法
TWI279760B (en) * 2003-07-11 2007-04-21 Toshiba Matsushita Display Tec Liquid crystal display
TWI335559B (en) * 2006-01-13 2011-01-01 Chimei Innolux Corp Liquid crystal display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10214067A (ja) * 1996-11-26 1998-08-11 Sharp Corp 液晶表示画像の消去装置及びそれを備えた液晶表示装置
JP2003050565A (ja) * 2000-06-29 2003-02-21 Matsushita Electric Ind Co Ltd 液晶表示システム、表示信号供給装置、及び液晶表示装置
JP2005031501A (ja) * 2003-07-09 2005-02-03 Sony Corp フラットディスプレイ装置及び集積回路
JP2006106293A (ja) * 2004-10-04 2006-04-20 Sharp Corp 表示素子駆動装置及びその表示素子駆動装置を備えた表示装置並びに表示素子駆動方法
JP2007025701A (ja) * 2005-07-20 2007-02-01 Samsung Electronics Co Ltd 表示装置の駆動装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010143501A1 (fr) * 2009-06-09 2010-12-16 シャープ株式会社 Appareil d'affichage et procédé de commande d'un appareil d'affichage
US8698788B2 (en) 2009-06-09 2014-04-15 Sharp Kabushiki Kaisha Display apparatus and display apparatus driving method

Also Published As

Publication number Publication date
CN101939779A (zh) 2011-01-05
US20100315405A1 (en) 2010-12-16
CN101939779B (zh) 2013-02-27

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